Fixation framework for ring-shaped permanent magnet
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United States of America Patent
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Oct 17, 2006
Grant Date -
Sep 30, 2004
app pub date -
Feb 24, 2004
filing date -
Mar 25, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A ring-shaped permanent magnet comprising a Nd--Fe--B magnetic material is integrally insert-molded within a distal part of an inner periphery of a cylindrical supporting member. By employing this structure, a coaxial alignment accuracy of the permanent magnet relative to the supporting member depends on only an accuracy of a die for insert-molding. Accordingly, the coaxial alignment accuracy improves, Moreover, the ring-shaped permanent magnet comprising the Nd--Fe--B magnetic material expands in its radial direction when cooled down, while the supporting member comprising a resin contracts, thus the permanent magnet is firmly held by the supporting member. Indeed, a pore space is not created between a bonded surface of the supporting member and that of the permanent magnet. Therefore, the coaxial alignment accuracy will not go wrong.
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